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Kelley, William Darrah

(Encyclopedia) Kelley, William DarrahKelley, William Darrahdârˈə [key], 1814–90, American legislator, b. Philadelphia. He was admitted (1841) to the bar and served (1847–56) as judge of the court of…

Du Pont, Pierre Samuel

(Encyclopedia) Du Pont, Pierre Samuel, 1870–1954, American industrialist, b. Wilmington, Del., grad. Massachusetts Institute of Technology, 1890. Du Pont worked as a chemist with the family's company…

slate

(Encyclopedia) slate, fine-grained rock formed when sedimentary rocks such as shale are metamorphosed by great pressure. Slate splits into perfectly cleaved, broad thin layers; this…

Sapir, Edward

(Encyclopedia) Sapir, EdwardSapir, Edwardsəpērˈ [key], 1884–1939, American linguist and anthropologist, b. Pomerania. Sapir was brought to the United States in 1889. After teaching at the Univ. of…

Spangenberg, August Gottlieb

(Encyclopedia) Spangenberg, August GottliebSpangenberg, August Gottliebouˈg&oobreve;st gôtˈlēp shpängˈənbĕrk [key], 1704–92, a bishop of the Moravian Church and a founder of that church in…

Erie, indigenous people of North America

(Encyclopedia) ErieErieĭrˈē [key], indigenous people of North America of the Iroquoian branch of the Hokan-Siouan linguistic stock (see Native American languages). In the Iroquoian language the word…

commonwealth

(Encyclopedia) commonwealth, form of administration signifying government by the common consent of the people. To Locke and Hobbes and other 17th-century writers the term meant an organized political…

china clay

(Encyclopedia) china clay, one of the purest of the clays, composed chiefly of the mineral kaolinite usually formed when granite is changed by hydrothermal metamorphism. Usage of the terms china clay…

Gibson, John, American frontiersman

(Encyclopedia) Gibson, John, 1740–1822, American frontiersman, b. Lancaster, Pa. After taking part in the capture (1758) of Fort Duquesne (renamed Fort Pitt) in the French and Indian War, he became a…

Greensburg

(Encyclopedia) Greensburg. 1 City (2020 pop. 14,976), seat of Westmoreland co., SW Pa.; settled c.1770, inc. as a city 1928. Located in a coal area,…